/*
    包含n个reducer函数的模块
 */
import {INCREMENT, DECREMENT} from './action-types'

export function counter(state = 0, action) {
    console.log("counter()", state, action);

    switch (action.type) {
        case INCREMENT:
            return state + action.data;
        case DECREMENT:
            return state - action.data;
        default:
            return state;
    }

}